【摘要】：恒流源是現(xiàn)代電子工業(yè)和科學(xué)實(shí)驗(yàn)不可或缺的儀器設(shè)備，廣泛應(yīng)用于電子測量、儀表調(diào)試、醫(yī)療器械和航空航天等領(lǐng)域。隨著電子技術(shù)的發(fā)展，數(shù)據(jù)采集與處理能力的不斷提高，，許多領(lǐng)域?qū)懔髟吹姆�(wěn)定度和精密度要求越來越高。只有具備高精度、高穩(wěn)定度、低紋波、大量程及強(qiáng)可靠性等特點(diǎn)的恒流源，才有更多的實(shí)用價(jià)值。 本畢業(yè)論文對可編程直流恒流源的工作原理進(jìn)行了詳細(xì)的研究，并設(shè)計(jì)了一款基于ARM的LPC1114程控恒流源系統(tǒng)。文中給出了具體的軟、硬件設(shè)計(jì)方案和系統(tǒng)調(diào)試結(jié)果，測試數(shù)據(jù)表明該恒流源系統(tǒng)實(shí)現(xiàn)了高精度、高穩(wěn)定度和低紋波的恒流輸出。整個(gè)系統(tǒng)主要包括LPC1114主控電路、線性穩(wěn)壓電源電路、D/A轉(zhuǎn)換電路、恒流輸出電路和電壓采樣電路。 在實(shí)現(xiàn)過程中，使用NXP公司ARM Cortex-M0核心芯片LPC1114作為主控制器。通過LPC1114內(nèi)嵌的A/D控制器完成對電壓采樣值的模數(shù)轉(zhuǎn)換，進(jìn)而將設(shè)定的電流值I D與實(shí)際輸出電流值I L進(jìn)行比較，并采用PI控制算法對電流偏差值進(jìn)行調(diào)整。如果電流偏差太大，主控制器就將其饋送回恒流電路，恒流電路對電流偏差值作出相應(yīng)的精度調(diào)整后輸出、再次采樣比較，直至輸出電流值逼近設(shè)定電流值滿足精度，并將結(jié)果顯示值LCD上。在完成了系統(tǒng)硬件設(shè)計(jì)和實(shí)現(xiàn)、軟件設(shè)計(jì)和程序編寫后，對系統(tǒng)性能進(jìn)行了測試。實(shí)驗(yàn)測試結(jié)果表明：輸出電流范圍為200mA到2000mA，系統(tǒng)實(shí)現(xiàn)了±2mA的微步進(jìn)調(diào)整，電流測量絕對誤差小于0.1％+3mA。系統(tǒng)運(yùn)行穩(wěn)定可靠，紋波特性良好，在高精度小功率領(lǐng)域具有較高的實(shí)用價(jià)值。
[Abstract]:Constant-current source is an indispensable instrument in modern electronic industry and scientific experiment. It is widely used in electronic measurement, instrument debugging, medical device, aerospace and other fields. With the development of electronic technology and the improvement of data acquisition and processing ability, the stability and precision of constant current sources are required more and more in many fields. Only the constant current source with high precision, high stability, low ripple, large number of program and strong reliability can have more practical value. In this thesis, the working principle of programmable DC constant current source is studied in detail, and a LPC1114 program controlled constant current source system based on ARM is designed. The hardware and software design scheme and system debugging results are given in this paper. The test data show that the constant current output with high precision, high stability and low ripple can be achieved by the constant current source system. The whole system mainly includes LPC1114 main control circuit, linear voltage stabilized power supply circuit and D / A conversion circuit, constant current output circuit and voltage sampling circuit. In the process of implementation, NXP ARM Cortex-M0 core chip LPC1114 is used as the main controller. Through the A / D controller embedded in LPC1114, the voltage sampling value A / D conversion is completed, and then the current value I D is compared with the actual output current value I L, and the Pi control algorithm is used to adjust the current deviation value. If the current deviation is too large, the main controller feeds it back to the constant current circuit, and the constant current circuit adjusts the current deviation value to the output, and samples and compares it again, until the output current value approaches the set current value to meet the accuracy. The result is displayed on the value LCD. After the system hardware design and implementation, software design and programming, the system performance was tested. The experimental results show that the output current ranges from 200mA to 2000mA.The system realizes the micro-step adjustment of 鹵2mA, and the absolute error of current measurement is less than 0.1% 3mA. The system is stable and reliable, and has good ripple characteristics. It has high practical value in the field of high precision and low power.
【學(xué)位授予單位】：蘇州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN86

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